Covington, M. V. (1992). Making the grade: A self-worth perspective on motivation and school reform. Cambridge University Press.
Чикаго-гийн эшлэл (17 дахь хэвлэлт)Covington, Martin V. Making the Grade: A Self-worth Perspective on Motivation and School Reform. Cambridge ; New York: Cambridge University Press, 1992.
MLA -ийн эшлэл (9 дэх хэвлэлт)Covington, Martin V. Making the Grade: A Self-worth Perspective on Motivation and School Reform. Cambridge University Press, 1992.
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